Low noise pulsed light source utilizing laser diode and voltage detector device utilizing same low noise pulsed light source.

摘要

A low noise pulsed light source utilizing a laser diode (38) for generating a short pulsed light of a high repetitive frequency. The low noise pulsed light source includes a laser diode (38) drived by an electric pulse generator (40) for emitting repetitive pulsed light; a current source for supplying a bias current to the laser diode (38); and a photodetector (42) for detecting the repetitive pulsed light emitted from the laser diode (38); and control means. The control means modulates at least one of the bias current from the current source and the amplitude of a pulse signal generated from the electric pulse generator (40) in accordance with an output signal from the photodetector (42) such that the intensity of the pulsed light is kept unchanged and nay noise involved in the same is reduce. A feedback system including the photodetector (42) and the control means has a beak in its frequency characteristics within a frequency band for light detecting in a light measuring system utilizing the low noise pulsed light source (73). <IMAGE>